Abstract
The aim of this paper is to present basic concepts and selected finite element based methods and tools for sensitivity analysis and rational engineering design and optimization of mechanical structures and components. The main emphasis is devoted to sensitivity and optimization problems that involve shape and sizing design variables.
The methods are selected from conditions of versatility, computational efficiency, and suitability for integration into an engineering design optimization system which realizes the design process as an iterative solution procedure of a multicriterion optimization problem based on the concept of integration of finite element analysis, sensitivity analysis, and optimization by mathematical programming. Typical design objectives that may enter into the multicriterion problem formulation include, e.g., structural cost, displacements and stresses from static and thermal loads, and structural vibration frequencies and buckling loads.
For these types of objectives, expressions for design sensitivities are derived, and the paper presents a new approach to semi-analytical design sensitivity analysis which is easy to implement as an integral part of the finite element analysis. The new approach is computationally inexpensive, and completely eliminates severe sensitivity errors that may occur in problems of semi-analytical shape design sensitivity analysis and optimization of certain types of structures. Such errors have been reported in several papers in recent years.
Use of the methods presented in this paper is illustrated by examples.
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Olhoff, N., Lund, E. (1995). Finite Element Based Engineering Design Sensitivity Analysis and Optimization. In: Herskovits, J. (eds) Advances in Structural Optimization. Solid Mechanics and Its Applications, vol 25. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0453-1_1
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